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WorksheetsInterference & Diffraction
Total questions: 25
Worksheet time: 25mins
Interference of light is evidence that:
the speed of light is very large
light is a transverse wave
light is electromagnetic in character
light is a wave phenomenon
In a Young's double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of:
quarter of a wavelength.
half a wavelength.
a wavelength.
three-fourths of a wavelength.
In a Young's double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance L must be changed to:
L/2
L 2
2L
4L
For destructive interference, the path difference is:
odd number of half wavelengths
even number of half wavelengths
whole number of wavelengths
even whole number of wavelengths
Constructive interference happens when two waves are:
out of phase.
zero amplitude.
in phase.
Extra distance travelled by one of waves compared with other is called
path.
displacement.
phase difference.
path difference.
What principle is responsible for light spreading as it passes through a narrow slit?
refraction
polarization
diffraction
interference
What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?
refraction
polarization
diffraction
interference
Light of wavelength 575 nm falls on a double-slit and the third order bright fringe is seen at an angle of 6.5o. What is the separation between the double slits?
5.0 micro-m
10 micro-m
15 micro-m
20 micro-m
One beam of coherent light travels path r1 in arriving at point Q and another coherent beam travels path r2 in arriving at the same point. If these two beams are to interfere destructively, the path difference r1 - r2 must be equal to
an odd number of half-wavelengths.
zero.
a whole number of wavelengths.
a whole number of half-wavelengths.
All of the following are evidence that light is a wave EXCEPT:
refraction
reflection
interference
diffraction
These two waves are _________.
monochromatic and in phase
monochromatic and out of phase
multichromatic and in phase
multichromatic and out of phase
These two waves will ________ interfere and result in a _________ amplitude.
constructively, increased
constructively, decreased
destructively, increased
destructively, decreased
The path difference between these two waves is ________.
0 waves
1 wave
2 waves
3 waves
These two waves would ______ interfere and cause the brightness to be at a _____.
constructively, minima
constructively, maxima
destructively, minima
destructively, maxima
The path difference between these two waves is ______ and would result in a _____-order bright spot.
6 wavelengths, sixth
3 wavelengths, sixth
6 wavelengths, third
3 wavelengths, third
In Young's double slit experiment, which laser would result in the closest together bright spots?
violet (410 nm)
blue (450 nm)
green (550 nm)
red (650 nm)
A photoelectric cell is used as a light sensor in a Young's Double Slit experiment. If the fourth maxima were found at a position of y = 12 cm, where would the third maxima be found?
depends on the wavelength
6 cm
8 cm
9 cm
A slit of width a is used to observe a diffraction pattern on a screen at a distance L from the slit.If the width of the slit were doubled, the width of the central bright band would
decrease by a factor of 4
decrease by a factor of 2
increase by a factor of 2
increase by a factor of 4
Light of wave length 3.5x102 nm is incident on a slit of width 0.5mm . Which of the following expressions corresponds to the angle at which the second order minimum is formed
sinθ= 2.2 x 10 -4
sinθ= 3.5 x 10 -4
sinθ= 1.1 x 10 -3
sinθ= 1.4 x 10 -3
Light of wavelength 2. 5 x 10 2nm is incident on a slit of width 0.3 mm. What order of dark band corresponds to
sinθ = 2. 5 x 10 -3
4
3
2
1
A single slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength of the illuminating light is doubled?
It will be cut to one -quarter its original size
It will be cut in half
It will double
It will become four times as large
